5 papers
Modeling brightness temperature of sunspots using ALMA single-dish observations
F. MatkoviÄ, R. BrajÅ¡a, A. O. Benz +5
We model sunspot brightness temperature in the wavelength range 0.3-10mm using the Atacama Large Millimeter/submillimeter Array (ALMA) single-dish measurements together with other…
An analysis of the solar differential rotation in solar cycle No. 19 (1954-1964) determined using Kanzelhoehe sunspot group positions
Ivana Poljancic Beljan, Luka Sibenik, Tomislav Jurkic +7
We study solar differential rotation (DR) for solar cycle No. 19 (1954-1964) by tracing sunspot groups on the sunspot drawings of Kanzelhoehe Observatory for Solar and Environmenta…
Modeling brightness temperature of prominences on the solar disk using ALMA single-dish observations
F. MatkoviÄ, R. BrajÅ¡a, A. O. Benz +5
Prominences (PRs) are among the most common solar phenomena, yet their full physical picture, particularly their chromospheric mm emission, remains incomplete. The new Atacama Larg…
BoÅ¡koviÄ's Spherical Trigonometric Solution for Determining the Axis and Rate of Solar Rotation by Observing Sunspots in 1777
Mirko Husak, Roman BrajÅ¡a, Dragan Å poljariÄ +5
In September 1777 RuÄer BoÅ¡koviÄ observed and measured the sun-spot positions to determine the solar rotation elements. In 1785, among other methods, he described a trigonometri…
BoÅ¡koviÄ's method for determining the axis and rate of solar rotation by observing sunspots in 1777
Mirko Husak, Roman BrajÅ¡a, Dragan Å poljariÄ +5
In 1777 RuÄer BoÅ¡koviÄ observed sunspots, determined their positions and the solar rotation elements by his own methods briefly described here. We repeat his calculations of the…